Table 3.

Risk Factors for Second Trimester Previa Persistence

	Unadjusted OR (95% CI)	Adjusted OR* (95% CI)
Prior Cesarean Delivery	1.97 (0.71–5.47)	1.94 (0.62–6.13)
Advanced Maternal Age	5.92 (2.34–14.98)	5.07 (1.88–13.68)
IVF or Reproductive Assistance	4.51 (1.58–12.86)	2.64 (0.77–9.02)
Posterior Placenta at First Trimester**	3.33 (1.19–9.32)	4.02 (1.33–12.15)

^*Multivariable regression including prior cesarean delivery, advanced maternal age, reproductive assistance, and placental location at first trimester scan

^**Reference for odds ratio was comparing to anterior placenta at first trimester scan